I don't think it's a taboo subject, it's just not really good journalistic form to employ relatively baseless speculation for more than a few sentences. Basica

I don't think it's a taboo subject, it's just not really good journalistic form to employ relatively baseless speculation for more than a few sentences. Basically, as a matter of principal they report on what the researchers are doing, and the researchers are (quite reasonably) going to try to beat Alzheimer's in patients who actually have it before they try to apply it to everyone. No sense in worrying about, Can this be globally administered, like a vaccine? before they even know for sure how to beat it.